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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec8a3702450bc6a07469818263f5026f27d61fff3d9498da996f72a8c2b6d5a' 
  AND token = '5um4ilSPr23nXKCj6h/t8AkRJVP98kHuw6+7oGoye6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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