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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0077fffcd31c95d594e439bac9572d6fe33d9611114c1569aac49bfabf750764' 
  AND token = 'bOi1wEB8iGuOv+sl4XKKORrWVWcqd8i4H+KEo5NrhIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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