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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c075c939c22aa95c19e6d216406e835a0f923436eac2e9d111f698c06cbdada' 
  AND token = 'wVHBvktorAD2PDXOV4R0/LGj+PNhzvS3lHnTMi3yHAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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