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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7839519d9b5390a40eae684bad4a91592959704d9500ef740d10f3673045dd34' 
  AND token = '/5adJy4APMpZXSCedA6vH2z42oKuTaRctpKn4uudZ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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