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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5394dea5c34abd185b39e50d9deb818d5d4fd63d0bbcff844185113f407089' 
  AND token = '0cs2pvAaNz3f3cTg3b7FsgcciwK1Syf0kAufNHnZfEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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