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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0e8304a0c67d64345e4ebe164a5c77f9fe10f691924cfdd1fb55ff9756e7fb' 
  AND token = 'KoiRCyMC3q9JYgHm7kWqj2yH8a2Usy5t8cFbzY+KvC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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