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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbb333e9d089a93e4a1de32211b6b2f2a0ff53d29ee8d316bcfaebcb0f27000' 
  AND token = 'nfv4Kw2oaceEVh4WwaRye3S+JqWTU0B4S7wJtVThjJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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