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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60b03ce1e95601f8b180aa23e38ea28b0df40f038fb278f29fb22e48ce23f8b' 
  AND token = 'GYU83i51dv126Lm3dB8QYaedyXWQ41WsfZaPvnIiJLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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