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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c3fa36e2206c26bca5540c74d41b4f56ec6c71b2a6149aeb17100855c0ce18' 
  AND token = 'owWZ9jh8xE+9Mx0b/2R3NCNjuJeWuHQ8mTBNedc4KpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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