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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548d4dbb57b84bfb1d8c256f1773cabd287b8d0fede3f019177ed6824f98aa1a' 
  AND token = 'jBj3kDkGNs+wMYtcC7Ksu7oh+NtDiv4l/AE3WWGbrAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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