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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6483fcf15db6d2e0fb774854113e724564443eec12bd087b24a2b71da1973dbd' 
  AND token = '6n8Smw+yUB0YFkBLiNqWD7VKOwA/NL8hXNDLy2LEovY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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