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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd859aeda31dc7ae84e089b15b82446cbf964e8b09f30e898b0acf50b48d2ec98' 
  AND token = 'jmA+typ62tvcsJCF+BRpd2MZ4MUXN0wsXUEyS3FlfCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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