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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef84c4ffc5a396d9900977c48fb60f8a8085478a4f5bfdd7a9fb6ad269457ab4' 
  AND token = 'rFHzNwScvc+5OTn/MmLVPQovm3k3bs6uFovvjof+Me0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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