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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a4434a852b2729b60667d03ad0c4c577eac2d23d6756546d0ef235e10333682' 
  AND token = 'jQB6w+0pXEikVFaDps2VbZjJFmHUp0ajLUR9NQyY35A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}