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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3aba80be527e8963d921d99ac88860d187a175094acb142c4cfb668f5e935e9' 
  AND token = '2LGW+dJ8Vi0Pq5KTtSbDN39qclwLu1YX8Im1oF1+OdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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