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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c7dda51e7ef1185f5694807aad15047b568e06e943827949e1d0c531f344a6' 
  AND token = 'RozQ45c+4txudxxGCRk68pfwTpJuxgOfWV4Q8Gwnbp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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