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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6cf2c5cad95f7d3e783650db7978986513b4f1306ce7b6151b670883347f0d' 
  AND token = 'lh5uasI102Mc4Tv3JsBTR1tbTFNHgyzf+APgh74/p3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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