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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f895f6e0cd5f636e6e09df8cb0921a01d0c88ba4fa168d82e209472ce9b7252' 
  AND token = 'tFppeOTxuRCIX6v/aBCESzYflVYctzahBNmpkoTRcwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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