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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b8fbfbd605692b80c369ef2bf5ed0f0272f9f85914bad71e194a90ca6ebf45' 
  AND token = 'VaNpL1J091rAbbf4jQ3Al6MeSK3/UD1eysL0urU/9R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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