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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856da6672fffc2c73f750ffa7a6e5834baeccc2c51ffcd68390ddb4a3d2560a6' 
  AND token = 'y1F3zeCm/g/QJVZFw5BLWdwjjalVjH2HHfXL7Dfi11g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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