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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c71d55120ec76fd5d67a07955474f75061c9873f7e10b6ec28bf6426cf2a4c' 
  AND token = 'EWKw/5QNFzjk8ymqpp1Ybe3A6KlmWDfAUqed5ewrVsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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