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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2cace75334c79bd710a0220ead5ccaf71cd6d668601d7764b8a5d8a7b2335ba' 
  AND token = 'KMDjAuDPY9nEufHmEVwokmumV00DsbiuUXURe9eRYPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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