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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266ea81f54dc3e1b6c67306fe8fa993d1a2f6d2a0c8816675e0ce74764798328' 
  AND token = 'hvcVf35IVz2uPROca9ZzEwSh0hUu+QEXIBbiNmRdplc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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