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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115d7365b7e1fe8e1251f7ecb3bc8d7169ba70b6afbfa3a3aa472b31170d9b05' 
  AND token = 'hrLU77Irm2uhAIWabZwKeT1B63v+eIRlxy42ioPxFa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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