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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827c0aacd2692a260d4994f886ff02d20196a3db2898751603b90575e9852afd' 
  AND token = '/BFXcVzkw7d5MIxFVyOQaWwVIcMGaYxvJIhP/hJN2Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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