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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a594dc1f99ae3cacdf510acf3c1f0d65f0831c1e26ecc70e12f812ffeca925c' 
  AND token = 'Vd4QVSKWZ2lETZxsj74Q+0JNAj8B3S7CrOn3P2HhtuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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