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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59fda2865895995dc0c7aa86fe46d46f43f0e9522160b55e889c4ea6e16d11c' 
  AND token = '7E5BiHlT7hbU9H6FNP9apG2womclwsqgKUA8qZuJEI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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