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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cac354f6dc4e54dd0448dc7dc0e8dbc3a97429440d500122dce5877a31a1bd3' 
  AND token = 'Px3Hbw5VT3ArYDZwEkq9CTFZp35CCm35/cWc9y2dDx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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