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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f18ff94d7eaff1caa9d6e32a7ee84b4ef19654ea8242a97365c2fc477f3235' 
  AND token = 'yrwvadsJ/U/gU5HgrAKoz9cyMvNmGqmWtk4sSv0cj+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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