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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0231c9603291e0408e3e69854ed911db340e21feb765445b810919df7db18df0' 
  AND token = 'XvfPPVwUlEkqx9vB/Z9i9djrCrB0sPipDphv3LU12jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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