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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fdfe82a313e2f6e57ae175289372de3710686973c649f7286545f07dd6c0f1' 
  AND token = 'Qs3302m569q5LKU5uryCCNeaRQekNOEWmvOMCHJN2rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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