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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c6096eb161eb06304378b8c381e090ff5bc4782a9db8d5857f0e50a1f44d21' 
  AND token = 'jWi8KLbnIAoaCPKJ3rjGISkYLj2LsLp7jCmfQ4dqqug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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