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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa63455727b5b8dedfcc2b23fd5a77326ae1a6f5ad769184d16cd070eeb979ae' 
  AND token = 'rRYAOre+IG+OBmuWKk01I6+eUIPbIG0Y49K+JrK5aOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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