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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e4cd9d3d6120b12e2a74ca3e871f6136413e095fce87b065a6066c8e67b247' 
  AND token = 'FDyOcTQF73beHil4XpFZ7RE8Z1/NwM9rZ1xBJaSvsoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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