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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93db9257475e4415fb68e8c309adac783837cf3c25966b80e01ec2eb8fbf7345' 
  AND token = 'hyyjxS9f+aRXsksDYSDnbGy4WdBgKQHsMGccRSMN3z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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