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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616caa16ecebe91a6e074716b398b15a07ec27884ef5f1c0fd47f2ddf9d72d59' 
  AND token = 'TafikOiCTTtNW3SwELG+ed28VnMFpICTgeRbuD2vn5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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