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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9793bccdb3de04bd38f15375039cbdcf7778937b527aa3c3b2e19c35219823e9' 
  AND token = 'x7Lbs4bqA1N1RDBEwodsbOUn/g01Lrj8qrbkkzXyr4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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