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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b53d0493d4e91a5365513fa5917f8a045bbcdcedac5a67dac2c3d6e819247d' 
  AND token = '1Vud5BLUDSrY4uscxfD/4zgaFiFk4air7dCsSUXPEu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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