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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d0f3b24836d7043282ae1e3b764d346ed92706aa9ef7d6fb689567d0b9cbd7' 
  AND token = '9tFjIfsln+/3oMzqzmdTwjPtsjPEaaNwlc/KxXmj/1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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