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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba7a6048f49b0aebd1f3a269777949eba65fd39139a1bd220dc1db060bc4399' 
  AND token = 'BTJPO/vguI3KlL0KHl150KgkqCC8ARu/fUWWkUP2pso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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