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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9787d4ef1511761369b10d1001fa8cba1173f36bbb510b4ff901cca0fd7b269' 
  AND token = '8CbURL1SE/ECiiKegyLk8lKtpeUwxLnvMakKK3tXlu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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