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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b877e724fe1a9d981edeafd481e5e8f6b97f61489741cb1f54f2bb75cfa5af' 
  AND token = 'FEaQSB8IgG32i2xqut6zVtVA+Ay5Bt/U4Ec+kg9QeE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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