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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d465f4261af65382e77eebc38af0fac745b7ba07c06b7b1c9d725c0383a0c84' 
  AND token = 'yjQM4AAYp+X3u7loH0SZS1Pso3RsPMr2jrDSeRWRl7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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