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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b50c4c8571136d1fe230ee19e266f5262857a0cd7cdacde761659ce71c56336b' 
  AND token = 'plrL3OTMuGJSPDulDN7pWIC48lvtKlQ1YIsu72Erwes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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