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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7ee1c94b08fa8ee51f156768e44d83455720592c6256cfabc9ec83c6e0daac' 
  AND token = '3SyxqQAXbWPxlXpV/Y8YGC8D9NLpH9aSyBhsk0nn8nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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