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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb9af26ca19aaeec3521eb63a758f150f8ee8400a25605f94adcf00c065223e' 
  AND token = 'xp3nYyq4hQuLB66kgo8VyoTpYuCV/WGyvpxaliLMxE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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