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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688c007ae16f83f1a2e6b31b57ae688923e41c5c4b88e16f5b01bd06f5289fcd' 
  AND token = 'L2hACGbuJ4qDGM8gyd2DCjpUPQL/GDy6JyzlWNHEqmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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