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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d260fb51a86ef9126c7606831d3da4ecaf0257fb4afec7b0e79f39f6c8b6103' 
  AND token = 'xO7wpmgXIsQeduCaXdKiuH8XrguCyuyPQ6/8q3WIA/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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