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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d942acf05a8d4b136b418342ffe37c303097a000550792e379e128957493709' 
  AND token = 'un96eT3vH1JwPES2G9o7/+czizZ+Fy60pAE/D9a+eHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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