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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1e2a53c77d307b0106496bd0cbc1d70b91a073f82af4429aed74790daaf56e' 
  AND token = 't+C+3skZlmndZjNo2tdJ1J2Bhp9INp5e88K7V1h6wG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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