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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43fdacfa858794bc126b93a89f1a2f9f33cb9c4a726aa766dab816fe583f8edb' 
  AND token = '4Ho7tCYiNNl6SFAhZFIGvMCd0oS1pt6+LFdzEWV/j7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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