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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700333bda75d561f25237b33dc33b248b02df0a09c6750dd99dc678257092f8f' 
  AND token = 'bAxje10GQFryIM7zjx9bjk77pEiUtoG1QnQLI5pJs/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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