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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c6af6932ebf16da52c433370c07712dd4732cd139a4e3f5664f93e4c91d1bc' 
  AND token = '1zCPSAHjqZopaxPPPZIZpR4p5SX0G8CUnNye6Z3oOJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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