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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da48a936bd1d929ee48f8a36d99057b189de7adc49fc419350b7518fc6095037' 
  AND token = '4r+xSn6tglTlLnlC2FzEBUBxmXv3r7Z080NN7gahDD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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