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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865bc993e23c5a3865c19b978b0fe5574eba3c2e44d0ade1452c23ccb3f5eab6' 
  AND token = 'CKWFvFDynfKCel7ayooMVHuJapm1guLniyTMgwyivic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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