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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a023411828c1761c13f122702168aa7c1614a430f159372eecb14a0e306d7e' 
  AND token = 'BbyBPWTaKtwCSz9PcWz0RJBS1WbKoLTPs6++WccAZZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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