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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9379ed76a70c8511b0c92d0ef8ecedb94845ea852a4231cb6e86cd7b2f4303' 
  AND token = 'pRftfOaBoMgpVoep21DUFVscJ/E7qvoxnpsr28ZHSKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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