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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8185e0845a579644a77c3778c96395baae2461dbdc56f13f07729dd992df5f56' 
  AND token = '283btVRZE3Eyo2Rn3oc9uv3ad1kflATRULJNf85ZfSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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