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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884fb7d07958033193c92dd77d53996abddcc4358ac07ab43f35992a506dca44' 
  AND token = 'MrD/17plAt41EzYOG+qpAckz+MaOWCZaK85oTXTtd20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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