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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90aaacf042a1a59f04b33f5314c5089cd8ff47ea00660b244dedbfe85aece1f4' 
  AND token = '4H8nmYlW5H9dTRjXLTncQkSMGefkcV1pSN8cVAdF1lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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