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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae663d997516aa38cb43307d6b4a74a19bbe5cc7cebbd1bb5efffe29d9028f4' 
  AND token = 'M0Tjf58kiH3Jb6OWWPX0NxSSJ3GLjKXKrossco7VIUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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