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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd849c04497ed3ffe5f66270e15fd510afc6076b5dd61cee4028ab10d94965c' 
  AND token = 'DgEJQHR37MMNfHf0J2d8CE9z0Tkf57CokmliDRxhIkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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