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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad07a27b023eeddb2bfa3675e6e05dfa1829a5520a82d5046be12d2d2a079ae8' 
  AND token = 'xdQ9bnU/XFGW/K3ssU48Oe5xZXYQ7rQ4oA9Bk2fqAaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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