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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e12e2360c8987d63d8d4bcd3a0754d325f9d8c4ca20a93dabff35a1fddcf6b' 
  AND token = 'FADSIYnnvn/1Ccw5JYFQkCzqSxfu3/rITXwOM0rWZ9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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