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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2612a40009fa68248626f22716517b07062c47d45675a4c3420d3abc2f2db3' 
  AND token = 'wNg+hvXikdBS2h39PbPy1IIpXUoAFcb/f4BydXhC24s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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